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Soot combustion over silver-supported catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
47762 46481 2009 10 PDF Available
Title
Soot combustion over silver-supported catalysts
Abstract

In this study the characterization and soot oxidation activity of Ag-based catalysts deposited on alumina, ceria and zirconia have been investigated. The combustion of soot was shown to be promoted by the presence of silver, especially in a zero valent state, over all the supports investigated. Presence of silver in a positive oxidation state is favoured with CeO2, while zero valent silver dominates over alumina and zirconia. This is likely attributed to the oxygen storage capacity of ceria which stabilizes silver in an oxidized form. Soot oxidation starts at low temperature (around 500 K for Ag on ZrO2) with a T50 in the range of 600–640 K. Deactivation under strong ageing conditions (1023 K for 12 h) is negligible with alumina and zirconia, while in the presence of ceria, which slows down formation of metallic silver from Ag2O, loss of activity following thermal treatments at high temperatures becomes more intense.

Keywords
Ceria; CeO2; Zirconia; ZrO2; Alumina; Al2O3; Silver; Ag; Ag2O; Oxygen storage; Soot oxidation; Diesel; Combustion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 91, Issues 1–2, 7 September 2009, Pages 489–498
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us